Slide buckle with lock and release



Dec. 19, 1961 F. DAVIS SLIDE BUCKLE WITH LOCK AND RELEASE Filed May 4, 1960 I II H PULL TO RELEASE I JNVENTOR. FRANK L. DAV/5 A TT P/YE Y States atent 3,013,318 Patented Dec. 19, 1961 3,013,318 SLIDE BUCKLE WETH LOCK AND RELEASE Frank L. Davis, 129-67 7th Ave., Coliege Point, N.Y. Filed May 4, 1960, Ser. No. 26,889 1 Claim. (Cl. 24-496) The invention herein disclosed relates to slide buckles of the type covered in the Frank L. Davis Patent 2,743,- 497 of May 1, 1956, in which the web is looped about a bar slidably mounted to clamp and hold the loop against a companion stationary clamp bar.

The present invention has for its objects to provide simple and practical means for securing the movable clamp bar so that it will not work loose under vibration and the like and which further may be operated to elfect the reverse, web releasing movement of the clamp bar.

Other desirable objects and the novel features of construction, combination and relation of parts through which such objects are attained are set forth and will appear in the course of the following specification.

The drawing accompanying and forming part of this specification illustrates a present practical embodiment of the invention. Structure however may be modified and changed as regards the immediate illustration, all within the true intent and scope of the invention as hereinafter defined and claimed.

FIG. 1 in the drawing is a side elevation of one of the new lock and release slide buckles with the web indicated broken away.

FIG. 2 is a front view of the same.

FIG. 3 is an enlarged broken sectional view on substantially the plane of line 3-3 of FIG. 2 showing the parts in the locked web securing position.

FIG. 4 is a similar view showing the parts in the web released position.

FIG. 5 is a broken sectional detail as on the plane of line 5--5 of FIG. 1.

In the embodiment illustrated the frame or base of the buckle is in the form of a sheet metal channel having parallel side walls 7 connected by a back wall 8.

This channel is shown as terminating in an angular extension 9 designed to be secured by bolts, screws or other fastenings 10 to an anchorage or support of some kind.

The web indicated at 11 is looped about a clamp bar 12 slidably mounted in slots 13 in the side walls of the base and movable toward and away from a companion stationary clamp bar 14, riveted or otherwise rigidly secured to the sides of the channel.

FIG. 3 shows how with tension on the web or straplike connection 11 the loop will be gripped and held by the slide bar 12 against the companion stationary clamp bar 14.

FIG. 4 shows how with tension on the web interrupted or released possibly through vibration or interruption of tension the slide bar may fall away from the companion stationary clamp bar and thus release hold on the web.

To prevent such possibility the present invention involves the provision of self-locking cams which will keep the clamp in holding engagement with the web and which may be operated to reverse efiect to release and maintain the web in slack condition.

These cams are shown in the form of slots 15 in levers 16 pivoted at 17 on the sides of the channel, receiving the projected rounded ends 18 of the slide and inclined on an angle to carry the slide toward and away from the stationary clamp bar 14 in swinging movement of the levers in reverse directions.

A handle bar 19 is shown connecting the free ends of the cam levers, bridging the sides of the channel and which may carry instructions, as shown in FIG. 2, for operation to set or to release the clamp.

Preferably the cam slots 15 are inclined at a gradual self-locking slope so as to automatically hold in any position of adjustment required for the firm grip of the webbing so that an operator need only push the locking handle so far as it will go.

Additionally there may be provided one or more registering lock pin openings 20 in the cam levers and side walls through which a locking pin, locking wire or the like 21 may be inserted.

With the locking cams in the clamp closed position thelweb will be held in the adjusted slack takeup condition regardless of vibration or the like. However when it is desired to release the web this may be positively effected by simply shifting the locking cams to the release position in FIG. 4 in which they withdraw the slide from gripping engagement with the web.

The invention provides a safety factor and positive actuation both ways to a web holding slide buckle without objectionably adding to the bulk or cost of such devices. Further safety is assured by the locking of the clamp closing cams in the web holding position through the use of the safety pin 21.

What is claimed is:

A lock and release slide buckle comprising the combination of a channel base having parallel side walls connected by a back wall, a stationary web clamp bar conmeeting said side walls, said side walls having slots therein extending toward said stationary clamp bar and said slidable clamp bar having end portions slidably engaged in said slots and extensions projecting beyond the outer sides of said sidewalls, cam levers pivotally mounted on the outer sides of said side walls over the ends of said slidable clamp bar and having cam slots therein receiving said projecting end extensions of the slidable clamp bar, and a handle for simultaneously operating said cam levers, said handle extending across said channel base and connected at opposite ends with the cam levers at the outer sides of said side walls and said cam slots being sloped to shift the sliding clamp bar toward and away from the stationary clamp bar in pivotal movements of the cam levers in opposite directions imparted by said connecting handle bar.

References Cited in the file of this patent UNITED STATES PATENTS 2,743,497 Davis May 1, 1956- FOREIGN PATENTS 588,241 Germany Nov. 16, 1933 1,072,643 France Mar. 17, 1954 

